If you thought Psystar was the only company making Macintosh "clones", then you are seriously mistaken. There is also German PearC, and the latest addition to the clone family is a Russian company called RussianMac, who debuted several Mac clones this week.

I don't think they have to, because Apple controls the whole stack, they could actually build the "ultimate DRM-device" if they like, the processor (from Intel) supports TPM/cpuid and the BIOS or firmware was desgined by Intel and Microsoft as trusted-software (Apple computers come with EMI right ?) and they obviously control the software as well. Then again XBOX is also still broken.